Re: Encryption key longer than text to encrypt

Jean-François Michaud wrote:
Sebastian Gottschalk wrote:
Jean-François Michaud wrote:

3- The transformation of digits varies during the encryption

My cipher only solidly met the first criterion. Context is lacking for
the second and third criteria.
If the third criteria wouldn't be trivially met, your scheme would be
trivially insecure.

It doesn't seem like you're trying to understand what I'm saying much
at all. I said that context was lacking, not that the criteria 2 and 3
weren't being met. They are of course also respected but the way the
definition is given, it raises questions which means the context is not
entirely clear, at the very least, to me.

Alright so I'm talking about a synchronous stream cipher, but the
original question still remains unanswered.
At first, you can strip the step about adding bogus data.

Why?

What remains is
the plain stream cipher. Depending on keylength and the complexity of the
operation, as well as on not exposing the internal scheme, it could be
secure.

I seriously doubt it's that simple. By internal scheme, do you mean the
encryption algorithm? The algorithm would most probably be known. For
real security, if possible, exposing the algorithm means that security
doesn't rely on it remaining a secret. This seems, overall, like a
better idea.

You just need a lot of big rotors.

512 rotors with 256 cogs each. But I feel that you're somehow missing
the essense of my question.

Regards
Jean-Francois Michaud

Sorry SG - my previous post suggesting someone learn the correct terminology was meant for Jean-Francois Michaud and not a complaint about you.
.

Relevant Pages

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